Multi-parameters decoupling method with Lamb wave sensor for improving the selectivity of label-free liquid detection

The anti-symmetric modes (A₀₁ mode for low frequency, A₀₃ mode for high frequency) and symmetric modes (S₀ mode) produced by Lamb wave sensor are used to detect multi-parameters of a liquid, such as its density, sound velocity and viscosity. These modes are found to be very different to the parameters. For example, the A₀₁ mode is very sensitive to the liquid´s density but the A₀₃ mode is sensitive to its sound velocity. The measurements of the attenuation with S₀ mode can give out liquid´s viscosity after its density been determined by A₀₁ mode. That could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of the selectivity of label free detection on biosensors.